نتایج جستجو برای: navigator and mendicant

تعداد نتایج: 16827503  

2009
M. HEDJAZI MOGHARI A. O'CONNOR P. HU V. TAROKH W. J. MANNING R. NEZAFAT

INTRODUCTION: In cardiac imaging, respiratory motion causes image artifacts and ghosting. Over the past two decades, several approaches have been proposed to minimize motion artifacts such as breath-holding, respiratory navigators or self-gating [1]. In high resolution imaging, respiratory navigators using a 2D selective RF excitation typically positioned on the right hemi-diaphragm, have been ...

1999
Hong Hu Zhi-Wei Sun Jian-Xin Liu HONG HU ZHI-WEI SUN JIAN-XIN LIU

Let Z and IR (C) denote the ring of the integers and the field of real (complex) numbers, respectively. For a field F, we put i* = F\{0}. Fix A GC and B G C*, and let X(A, B) consist of all those second-order recurrent sequences {wn}neZ of complex numbers satisfying the recursion: n+i = „ ~ n-i (i.e., Bwn_Y = Awn wn+l) for n = 0, ± 1, ± 2,.... (1) For sequences in SE(A,B), the corresponding cha...

2015
Elizabeth Kelly Noah Ivers Rami Zawi Lianne Barnieh Braden Manns Diane L Lorenzetti David Nicholas Marcello Tonelli Brenda Hemmelgarn Richard Lewanczuk Alun Edwards Ted Braun Kerry A McBrien

BACKGROUND Individuals with chronic diseases may have difficulty optimizing their health and getting the care they need due to a combination of patient, provider, and health system level barriers. Patient navigator programs, in which trained personnel assess and assist patients in overcoming barriers to care, may improve care and outcomes for patients with chronic disease by providing an altern...

Journal: :Journal of magnetic resonance imaging : JMRI 2005
Lindsey A Crowe Jennifer Keegan Peter D Gatehouse Raad H Mohiaddin Anitha Varghese Karen Symmonds Timothy M Cannell Guang Zhong Yang David N Firmin

PURPOSE To improve 3D volume-selective turbo spin echo (TSE) carotid artery wall imaging by incorporating navigators to reduce artifacts caused by swallowing. MATERIALS AND METHODS Images were acquired on a Siemens Magnetom Sonata 1.5T scanner. 3D volume-selective TSE scans of the carotid arteries were acquired in six healthy volunteers. A cross-pair navigator placed on the back of the tongue...

2017
Sean M. Hamlet Christopher M. Haggerty Jonathan D. Suever Gregory J. Wehner Kristin N. Andres David K. Powell Richard J. Charnigo Brandon K. Fornwalt

BACKGROUND Left ventricular (LV) torsion is an important indicator of cardiac function that is limited by high inter-test variability (50% of the mean value). We hypothesized that this high inter-test variability is partly due to inconsistent breath-hold positions during serial image acquisitions, which could be significantly improved by using a respiratory navigator for cardiovascular magnetic...

2009
D. Xu R. S. Hinks B. D. Collick

INTRODUCTION In dynamic echo-planar imaging (EPI), such as functional MRI, where a time series of EPI images are collected, there is additional modulation along echo readout due to changes in hardware states (e.g., temperature) that the standard reference scan based phase correction methods [1-3] cannot account for, thereby resulting in an increase of ghost level over time. To address this prob...

2016
Sean M Hamlet Jonathan D Suever Jonathan D Grabau Gregory J Wehner Moriel Vandsburger Kristin N Andres David Powell Vincent L Sorrell Brandon K Fornwalt

Background Advanced cardiac magnetic resonance (CMR) acquisitions often require long scan durations that necessitate respiratory navigator gating. This is particularly important in children with limited ability to hold their breath. We hypothesized that visual feedback of diaphragm position using an interactive videogame during CMR would increase navigator efficiency and improve image quality i...

Journal: :Foresight-Russia 2009

2012
Huan Tan Ioannis Koktzoglou Christopher Glielmi Mauricio Galizia Robert R Edelman

BACKGROUND Cardiac and navigator-gated, inversion-prepared non-enhanced magnetic resonance angiography techniques can accurately depict the renal arteries without the need for contrast administration. However, the scan time and effectiveness of navigator-gated techniques depend on the subject respiratory pattern, which at times results in excessively prolonged scan times or suboptimal image qua...

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